Failure of paint to dry to a smooth film, resulting in unsightly brush and roller marks after the paint dries.
Possible Causes:
Use of lower quality paint
Application of additional paint to "touch up" partially dried painted areas.
Re-brushing or re-rolling partially dried painted areas.
Use of the wrong type of roller cover or poor quality brush.
Solution:
Use top quality latex paints, which are generally formulated with ingredients that enhance paint flow. Brush and roller marks thus tend to "flow out" and form a smooth film. When using a roller, be sure to use a cover with the recommended nap length for the type of paint being used. Use of a high quality brush is important; a poor brush can result in bad flow and leveling with any paint.